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Battery system and battery management device

a battery management and battery technology, applied in secondary cells, battery servicing/maintenance, instruments, etc., can solve the problem of longer time for convergence to ocv than usual, and achieve the effect of high-quality ocv

Active Publication Date: 2021-08-26
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention allows for the accurate estimation of the secondary battery's OCV (open circuit voltage) right after charging and discharging.

Problems solved by technology

Further, even in a general battery cell, the time for convergence to OCV becomes longer than usual at a low temperature or in a state where degradation has progressed.

Method used

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  • Battery system and battery management device
  • Battery system and battery management device
  • Battery system and battery management device

Examples

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Embodiment Construction

[0020]FIG. 1 is a diagram showing an example of an equivalent circuit model of battery cell 10. FIG. 1 shows an equivalent circuit model of a lithium ion secondary battery as the equivalent circuit model of battery cell 10. Open circuit voltage Vo (=OCV) indicates a DC voltage source that represents the electromotive force. DC resistor Rd indicates a resistance component when a current flows through a solution or an electrode. The polarization voltage indicates the difference between total voltage Vc of open circuit voltage Vo and a voltage applied to DC resistor Rd and the measured voltage between both ends of battery cell 10.

[0021]The electrode reaction goes through the processes of charging an electric double layer, a charge transfer reaction, and diffusion in an active material. Electric double layer capacitance Cdl in FIG. 1 is a capacitance component indicating charge accumulation due to the charging current of the electric double layer. Reaction resistor Rr indicates a resist...

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Abstract

A voltage measurer measures a voltage of a battery cell. A controller controls charging-discharging of the battery cell. The controller performs control to apply a reverse current for canceling a polarization voltage of the battery cell through the battery cell after the completion of charging-discharging of the battery cell. For example, after the charging-discharging of the battery cell completes, the controller sets a current command value, in a power converter, that instructs flow of a reverse current of a preset value for a preset time.

Description

TECHNICAL FIELD[0001]The present invention relates to a battery system including a battery cell such as a lithium ion battery, and a battery management device.BACKGROUND ART[0002]For secondary batteries such as lithium ion batteries, it is required to accurately estimate SOC (State Of Charge). In particular, it is important that secondary batteries installed in electric vehicles such as hybrid vehicles (HVs), plug-in hybrid vehicles (PHVs), and electric vehicles (EVs) accurately estimate the SOC in order to correctly grasp the cruising range. The SOC is generally uniquely associated with OCV (Open Circuit Voltage).[0003]A secondary battery is an electrochemical product, and when a charging current flows through the secondary battery, the measured voltage rises non-linearly, and when a discharge current flows through the secondary battery, the measured voltage drops non-linearly. The voltage measured when a current is flowing through the secondary battery is called CCV (Closed Circui...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02J7/34H02J7/00G01R31/3835G01R31/396H01M10/44H01M10/48H01M10/42
CPCH02J7/345H02J7/0048H02J7/0013G01R31/3835H01M2010/4271H01M10/44H01M10/48H01M10/425G01R31/396G01R31/3842H01M2220/20Y02E60/10
Inventor NISHIKAWA, SHINYAWATANABE, TOHRUIIDA, TAKASHI
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD